Q4_study_guide_124 - atomic size o What is a Born Haber...

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Quiz 4 Study Guide Chapter 12 (3D Unit Cells Re-visited) o Know # of atoms per unit cell for FCC, SC, BCC o Know different contributions of different types of atoms to unit cell; eg, an edge atom contributes 1/4, etc. o Know how to determine formula for a compound using unit cell picture or z- diagrams o also how to determine charge on ion in unit cell from formula o Be able to figure out or memorize edge length in terms of radius in each case and its relationship to volume of unit cell in general (eg, volume = edge 3 ) o Know how to find mass of unit cell, volume of unit cell o Know how to calculate or use the density or radius of atoms that have these structures (see end of the solid state workbook 1 for practice problems) Chapter 9.2 (Ionic Compounds) o What is Lattice Energy? (energy to break apart an ionic solid into gaseous ions) o Comparing lattice energies of different ionic compounds (using charges and
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Unformatted text preview: atomic size) o What is a Born Haber cycle? How can you use it to calculate Lattice Energy? (Does Hess’s Law mean anything to you?) Chapter 12 o Band Theory What it illustrates Origin of band structure • Quantized energy levels in extended solids form bands • Molecular orbital theory – bonding and anrtibonding orbitals form bands Different materials’ characteristic band structures • Conductors, nonconductors, and semiconductors Connection of bands to bonding type • Ionic, covalent, and metallic o Relationship of size of band gap to periodic properties and bonding type (ionization energy and atomic size) Higher IE, electrons harder to move, larger band gap Smaller atoms, more overlap in the bonds, larger band gap I will give you: a periodic table 1 eV = 1.602 x 10-19 J N A = 6.022 x 10 23 mol-1...
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